Banca de DEFESA: NIXDALI FREIRE DE OLIVEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : NIXDALI FREIRE DE OLIVEIRA
DATE: 05/06/2026
TIME: 14:30
LOCAL: Remoto
TITLE:

EVALUATION OF THE PERFORMANCE OF SOCIAL SANITATION TECHNOLOGIES IN A RURAL COMMUNITY IN THE BRAZILIAN SEMI-ARID REGION

KEY WORDS:

Rural sanitation; Social technologies; Organic residues; Reuse; Sustainability in semi-arid regions.

PAGES: 96
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUMMARY:

tilizer.

The lack of basic sanitation is one of the main socio-environmental challenges in Brazil, particularly in rural areas, where access to such services is more limited. In semi-arid regions, this situation is further aggravated by socio-territorial specificities and water scarcity. In this context, the reuse of treated domestic wastewater emerges as a strategy capable of integrating the agricultural and sanitation sectors, providing water and essential nutrients for agricultural production. Additionally, the use of organic livestock waste contributes to nutrient recycling and promotes the circular bioeconomy. The main objective of this study was to evaluate the performance of social technologies aimed at the agricultural reuse of treated domestic wastewater-namely the Biodigester Septic Tank and the “Bioágua Familiar” -as well as the biodigestion of animal waste through the Sertanejo Biodigester, installed in five rural properties in the Catolé community, located in the municipality of Lajes Pintadas, Rio Grande do Norte, Brazil. The methodology was based on two complementary approaches. The first consisted of a technical and laboratory analysis of the effluents produced by these technologies. The results indicated that the effluents from FSB and BF have potential for agricultural use; however, they showed high values of Sodium Adsorption Ratio (SAR), electrical conductivity (EC), and thermotolerant coliforms, highlighting the need for system improvements and proper fertigation management. The BS demonstrated efficiency in biogas production, with methane (CH₄) content above 55%, being used for cooking as a substitute for firewood and liquefied petroleum gas (LPG). The digestate produced in the process, rich in macro- and micronutrients, proved to be viable as a biofertilizer. The second approach involved the application of a semi-structured questionnaire to assess the social and agricultural profile of the five rural units, as well as the development of sustainability indicators across three dimensions (environmental, social, and economic), resulting in a Global Sustainability Index of 0.87, considered high. This result is associated with factors such as increased and diversified agricultural production, improved phytosanitary management, generation of organic fertilizers, and biogas supply, leading to a reduction in firewood extraction and LPG consumption.

COMMITTEE MEMBERS:
Presidente - 3216945 - HÉRIKA CAVALCANTE DANTAS DA SILVA
Externa ao Programa - 2012116 - CIBELE GOUVEIA COSTA CHIANCA - UFRNExterna ao Programa - 2736085 - SANDRA RUFINO SANTOS - UFRNExterna à Instituição - DAYANA MELO TORRES - IFRN